RestekCorporation
(800) 356-1688
TheStabilwax
®
columndemonstrates aphase transitionbelow40°C, resulting in
decreasedefficiencyand separationpower.
Rtx
®
-Wax exhibits lowest bleedprofileat 250°C.
26.938pA
BrandX
6.185pA
Rtx
®
-Wax
(Lot#67633)
17.500pA
BrandY
Figure 2
30m, 053mm ID, 1.0µm Stabilwax
®
(cat.# 10655). 0.1µl split injection of volatile solvents.
On-column conc.:
60ng;
Oven temp.:
20°C (hold 10min.) to 100°C@ 5°C/min.;
Inj./det. temp.:
200°C;
Carrier gas:
helium;
Linear velocity:
40cm/sec. set @ 20°C;
FID sensitivity:
8 x 10
-11
AFS;
Split ratio:
10:1
Thermal Stability to 250°C
Crosslinkingor bondingof thePEG
stationaryphaseminimizes bleed to
ensureaccurate identificationand
quantitationof higher-boilingcompo-
nents.As a result,minimal detector
contaminationandextendedcolumn
lifetime areobserved.Only a small
baseline rise is evident at themaximum
operating temperature for the stationary
phase. In comparison to similar PEGs
fromothermanufacturers, theRtx
®
-Wax
exhibits the lowest bleedprofile at
250°C (see
Figure 3
).
Resolution of BTEX isomers
ThenewRtx
®
-Wax columnoffers the
same selectivityasotherCarbowax
®
columns for isomers of substituted
aromatics. This is useful forBTEX
analyses that require the specific
quantitationof the individual xylene
isomers.
Figure 4
illustrates that all
components in theBTEX analysis
(includingmeta-, para-, andortho-
xylene) are completely resolved in just
13minutes.
Figure 3
Bleed profiles on three types of PEG columns
30m, 0.25mm ID, 0.50µm
Oven temp.:
40°C to 175°C@ 6°C/min. to 250°C@ 15°C/min.
(hold 5min.);
Inj./det. temp.:
250°C;
Carrier gas:
hydrogen;
Linear velocity:
45cm/sec. set @ 40°C;
FID sensitivity:
8 x 10
-11
AFS
1
2,3
4
5
6
7
8
min. 5
10
15
20
25
1. acetaldehyde
2. acetone
3. ethyl formate
4. ethyl acetate
5. methanol
6. ethanol
7. n-propanol
8. isobutanol
28
30
min.
28
30
min.
28
30
min.
